Under the iTunes in the Cloud section, click Manage Devices. (If you haven't associated any devices with your Apple ID, you won't see the Manage Devices section.) Information about each associated device appears. Next to each device, you can see when it associated with your Apple ID.
The real reason why the burp smells so badly is hydrogen sulfide (H2S). If you eat foods that have sulfur proteins in them then you may find yourself burping the H2S, which will smell like rotten eggs. The sulfur reducing microbes in the intestine digest the proteins and release the gas.
Burp smelly: If the burping is not too frequent compared to other people, then it may not be a case of gastric reflux, which needs treatment. The odor of the burp is never an issue. What a person brings up into the mouth never taste good neither does it smell good, simply=what is below should stay below! ...Read more.